As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
R1 DOOR WILL NOT RELEASE TO ALLOW CLOSURE. IAW MEL 52-7D CONTACTED MAINTENANCE. ACFT GROUNDED, REF LP 11625772, R1 DOOR GUST LOCK PIN MISSING. R1 DOOR LEVER ON MEL 52-7D. MANUALLY RELEASED LEVER. OPS CHECK NORMAL. R & R R1 RELEASE BUTTON ASSY. OPS CHECK GOOD. REF AMM 52-41-21. THIS CLEARS MEL 52-7D.